IBM 727 Manual Of Instruction page 66

Magnetic tape unit and tester, electronic data-processing machines
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DUO RELAYS
POINTS
N O . COIL
AU
AL
BU BL
1
H
A
D
G
D
2
C
C
3
H
A
H
D
4
E
D
D
5
G
D
B
E
6
G
E
D
K
7
G
8
F
D
E
F
A
F
G
9
F
10
G
A
F
F
A
11
D
H
E
12
F
13
H
14
H
A
C
FP
B
Relay
PICK
POINTS
HD 1
H
HD 2
H
HD 3
H
H
HD 4
HD 6
E
HD 7
D
B
HD 8
G
DP 1
E
DP 2
H
DP 3
F
WIRE CONTACT RELAYS
N O . COIL
1
17
A
C
D
18
B
C
G
19
L
K
20
A
A
F
ApCt
A
21
E
22
D
H
26
FpCt
H
F
30
A
A
E
E
31
C
E
33
l
1
G
34
E
I
35
I
1
36
K
1
40
L
C
41
LpKt
A
J
42
LpKt
1
MISCELLANEOUS
AC-DC Fuse Micro-switch
Capstans in micro-switch
Capstans out micro-switch
Door interlock
F . P. sensing pin
Fwd-Rev .manual pushbutton
Head coverdown micro-switch
Head cover upmicro-switch
Column flapper micro-switch
Time delay point
Load-rewind Key
Unload key
Start key
Reset key
No vacuum micro-switch
Reel arm contact
Reel arm latch sol.
Retracting so l.
Retract sol . latch
LO CATIO N CHART
POINTS
4
6
7
2
3
5
H
J
K
K
1
K
J
K
D
C
D
D
J
E
J
J
K
E
C
D
1
1
E
1
J
J
1
J
H
K
J
K
G
K
L
A
G
D
A
B
i
F
F
G
E
A
A
A
A
A
D
B
B
B
8
H

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